206728467553 has 2 divisors, whose sum is σ = 206728467554. Its totient is φ = 206728467552.

The previous prime is 206728467499. The next prime is 206728467557. The reversal of 206728467553 is 355764827602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167549411584 + 39179055969 = 409328^2 + 197937^2 .

It is a cyclic number.

It is not a de Polignac number, because 206728467553 - 2¹³ = 206728459361 is a prime.

It is a super-4 number, since 4×206728467553⁴ (a number of 46 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206728467494 and 206728467503.

It is not a weakly prime, because it can be changed into another prime (206728467557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103364233776 + 103364233777.

It is an arithmetic number, because the mean of its divisors is an integer number (103364233777).

Almost surely, 2^206728467553 is an apocalyptic number.

It is an amenable number.

206728467553 is a deficient number, since it is larger than the sum of its proper divisors (1).

206728467553 is an equidigital number, since it uses as much as digits as its factorization.

206728467553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 55.

The spelling of 206728467553 in words is "two hundred six billion, seven hundred twenty-eight million, four hundred sixty-seven thousand, five hundred fifty-three".